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1 April 2010 Can a Specialist Parasitoid, Macrocentrus cingulum (Hymenoptera: Braconidae), Influence the Ecotype Structure of Its Preferred Host Ostrinia nubilalis (Lepidoptera: Crambidae) ?
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Abstract

Synchronization between a parasitoid and its preferred host is an essential strategy for successful biological control. Two ecotypes of Ostrinia nubilalis (Hübner) (Lepidoptera: Crambidae) in North America are distinguished by their voltinism. In this study, the differential impact of a specialist parasitoid, Macrocentrus cingulum Brischke (Hymenoptera: Braconidae), on the univoltine and multivoltine populations of O. nubilalis is investigated. Four years of field and laboratory study suggested that M. cingulum emergence was synchronized with the spring emergence of the multivoltine ecotypes of O. nubilalis in Pennsylvania. Univoltine populations experienced minimal parasitism from M. cingulum. Field-collected data suggested that the postdiapause multivoltine O. nubilalis field population was male biased, whereas the univoltine population was female biased. M. cingulum-parasitized postdiapause O. nubilalis larvae were significantly heavier than the male and nonparasitized female larvae. Sex ratio differences observed in overwintered O. nubilalis populations in the presence or absence of M. cingulum parasitism suggested preferential parasitism between male and female O. nubilalis larvae. Correlation between the larger parasitized O. nubilalis larval host and the number of adult parasitoids emerging per host suggested a potential evolutionary advantage to parasitizing female or larger hosts.

© 2010 Entomological Society of America
Faruque U. Zaman, Dennis D. Calvin, Edwin G. Rajotte, and Douglas V. Sumerford "Can a Specialist Parasitoid, Macrocentrus cingulum (Hymenoptera: Braconidae), Influence the Ecotype Structure of Its Preferred Host Ostrinia nubilalis (Lepidoptera: Crambidae) ?," Journal of Economic Entomology 103(2), 249-256, (1 April 2010). https://doi.org/10.1603/EC09110
Received: 15 April 2009; Accepted: 1 November 2009; Published: 1 April 2010
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